A fire in a signal house near the eastern end of Dallas Area Rapid Transit's Blue Line light rail has caused suspension of train service between downtown Rowlett and Garland.

DART officials said they are investigating the cause of the fire and assessing damage. But it anticipates repairs will take until Wednesday. Meanwhile, buses are shuttling passengers between the station in Rowlett, where trains are unable to function, and the Blue Line in operation a few miles west in downtown Garland.

Downtown Rowlett is the final stop on the Blue Line and the only station affected. Delays, according to DART, have generally been 10 minutes or less.

The fire happened early Wednesday in the signal house, which helps control DART train switches and power on that part of the line.